简介：A0.02%Cplaincarbonsteelanda0.11%CNb-modifiedsteelweretestedincompressionintheaustenitetemperaturerange.Thecriticalstrainsfortheinitiationofdynamicrecrystallizationweredeterminedfromthe41stress-straincurvesobtained,usingthedoubledifferentiationmethod.Theworkhardeningbehavioruptothecriticalstrainwasanalyzedwiththeaidofadislocationdensitymodelandtheworkhardeningparametersrandhwerederivedinthisway.Theseparameterswereusedtomodeltheausteniteflowcurvesbeyondthecriticalstrain,i.e.intheabsenceofdynamicrecrystallization.Thenetsofteningattributabletodynamicrecrystallizationwasdefinedasthedifferencebetweenthecalculatedworkhardeningcurveandtheexperimentalflowcurve.ThesofteningdataareexpressedintheformofAvramikinetics.UsingthedependencesoftheworkhardeningparametersandAvramikineticparametersonZ,theZener-Hollomonparameter,itisshownhowtheflowcurvespertainingtoindustrialrollingconditionscanbemodeled.

简介：In2009,thepigironoutputofChinaincreaseddramaticallyupto543.75Mtandwas15.87%higherthanthatin2008,accountingfor60.53%oftheworldproduction.Theprocessingofpigironmustconsumehugeamountofironoresandcoalandconsequentlyleadstotheshortageoforesandcokemakingcoalssupply,withpricessoaringbutqualityworseningremarkably.HowtomaintainorevenimprovetheefficiencyofblastfurnaceproductionundernegativeconditionsofconstantlyworseningresourcesofironoreandcoalhasbecomeanimportantscenariotheChineseironmakingindustrymustface.Inthispaper,theproductionwithhighcoalinjectionrate,lowfuelrateandbigproductivityintheWuhanIronandSteelCorporation（Group）wasintroducedandrevealed.Thequantitativecorrelationbetweenblastfurnaceproductionefficiencyanddiversetechnicalmeasuresthroughcombinedmass-heatbalancesandgas-liquidcounter-currentflowdynamicsanalysis.Moreover,potentialproblemsandcountermeasuresinironmakingbyfeedinghighAl2O3andlowgradeironoreswerealsodiscussed.

简介：Thisstudyestablishedathree-dimensionalmathematicalmodeltodeterminethefluidflowinaslabcontinuouscastingmoldunderanelectromagneticstirringforce.Theflowstructureanddistributionwerestudiedwithrespecttodifferentcontinuouscastingparametersandstirringcurrent.Basedonthecalculationresults,themoldfluxentrapmentindexinfreesurfaceandvelocityuniformityindexwereusedtoevaluatetheflowfieldinthemold.Thetheoreticalbasisfortheoptimizationoftheflowfieldstructurewasprovided.Thestudyalsosuggestedanoptimizationmethodforelectromagneticstirringparameters.

简介：Aphysicalmodelwithmercuryasanalogwasdevelopedtoinvestigatetheinfluencesofelectromagneticstirring(EMS)onflowfieldinslabcontinuouscastingwhenthesubmergedentrynozzle(SEN)wascloggedwithdifferentcloggingrates(0,10%,25%,and50%).TheflowfieldinmoldunderdifferentEMScurrents(0,40A,and60A)wasmeasuredbyanultrasonicDopplervelocimeter.Theresultsprovedthattheflowfieldinthemoldwasatypicaldoublerollstructureundernon-cloggingSEN.AstheSENcloggingrateincreased,theflowfieldstructurewastransformedfromadoublerolltoasymmetryflow.Whenthecloggingratereached50%,theupcirculationdisappearedonthecloggedside.Thezoneunderthemeniscusnearthenarrowfacewasanon-flowingarea.EMScouldcorrectbiasflowcausedbySENcloggingandimprovethesymmetryoftheflowfieldduringSENclogging.

简介：Microporoustitaniumdioxidefilmswerepreparedbythesol-gelmethodsonglasssubstrates,usingtetrabutyltitanateassourcematerial.Inordertoabsorbthevisiblelightandincreasethephotocatalyticactivities,differentconcentrationsofneodymiumions(Nd/Timolarratiowas0.5%,0.7%,0.9%,and1.1%respectively)wereaddedintothesol.X-raydiffraction(XRD),X-rayphotoelectronspectros-copy(XPS),andatomforcemicroscopy(AFM)wereappliedtocharacterizethemodifiedfilms.Akindoftypicaltextileindustrypollutant(RhodamineB)wasusedtoevaluatethephotocatalyticactivitiesofthefilmsundervisiblelight.TheresultsshowedthattheactivitiesofthefilmswereimprovedbydopingNdionsintothesol.

简介：Anon-linecontrolmethodofsurfacequalityforcontinuoushot-dipgalvanizedsteelstripaftercoolingispresented,whichcombinesanalyticaldynamicstheoryofathinplatewiththefiniteelementmethod.Theinherentcharacteristicsofthenon-immersedandpartiallyimmersedstripinliquidzincwerecalculatedonthebasisoftheoreticalanalysisandnumericalsimulation,respectively.Multi-parameterfittingofthedeviationbetweenresultsusingdifferentmethodswasperformed.Tooptimizethestripexcitationfrequencyawayfromtheresonanceregion,on-linevibrationcontrolofthestripneartheairknifeunderfullproductconditionswasachievedbychangingthefieldproductionparametersbasedonthefieldtestresults.Theresultsindicatethatalthoughtheaxialvelocityhaslittleeffectontheinherentcharacteristicsofthestripcomparedwithothermanufacturingparameterssuchasthesteelspecificationsandtension,itinducesexternalexcitations,includingmovingtheaerodynamicloadandbearingvibration.Tosomedegree,thevibrationneartheairknifecanbereducedbystrengtheningthesupportstiffnessofthecontactrolls.Atotalon-linecontrolprogramofsurfacequalityforcontinuoushot-dipgalvanizedpureZnandgalvannealedsteelsheetinthecoolingsectionisproposed.

简介：ThemorphologyandcorrosionbehaviorofNi/Al2O3compositecoatingspreparedusingdouble-pulsedelectrodepositingtechniqueafteroxidizedunder800℃NaCldepositinairenvironmentwereanalyzedbyscanningelectricalmicroscope(SEM),X-raydiffraction(XRD)andenergydispersivespectrum(EDS).TheresultsshowedthatthecorrosionofallcompositecoatingswasacceleratedunderNaCldeposits,andthecorrosionproductswereratherporouswithpooradherencetothematrix.Al2O3particlesinthecoatingscanrefinethegrainsizeandimprovethehightemperaturecorrosionresistanceofthecoatings.Withinthetestscope,themoreAl2O3particlesinthecoatings,thelowercorrosionratescouldbeobtained,andthecorrosionmechanismwasalsodiscussed.

简介：AseriesofSm~(3+)dopedY_2MoO_6werepreparedthroughhightemperaturesolidstatereactiontechnique.Theirphasestructures,morphologiesandluminescencepropertieswereinvestigatedbyX-raydiffraction(XRD),scanningelectronmicroscopy(SEM)andphotoluminescencespectrometry.ThemostintenseabsorptionofY_2MoO_6hostoccurredat367nm.EnergytransferfromhostlatticetoSm~(3+)ionscouldbeobserved,andtheschematicdiagramofenergytransferwasconstructed.ThecriticalenergytransferdistanceandenergytransfermechanismbetweenSm~(3+)ionswerediscussedindetail.Consideringthehighcolorpurityandappropriateemissionintensity,Sm~(3+)dopedY_2MoO_6couldbeapromisingphosphorundernearultravioletlightexcitation.

简介：AdetailedstudyofthefluorescenceemissionpropertiesandenergytransfermechanisminEr3+/Tm3+co-dopedleadsilicateglasseswasreported.Enhancednearinfrared1.8μmandvisibleup-conversionemissionswereinvestigatedunder808and980nmexcitations,respectively.TheenergytransfermechanismbetweenEr3+andTm3+wasanalyzedaccordingtotheabsorptionspectra,theemissionspectraandthelevelstructuresofEr3+andTm3+.TheenergytransferefficiencybetweenEr3+andTm3+reached68.1%intheEr3+/Tm3+co-dopedleadsilicateglasseswhenpumpedby808nmlaserdiode.Basedontheabsorptionspectra,theJudd-Ofeltparameters,spontaneousemissionprobability,absorptionandemissioncrosssections,gaincoefficientswerecalculatedandanalyzed.Itwasfoundthatthecalculatedemissioncrosssectionandthemaximumgaincoefficientaround1.8μmwere4.9×10–21cm2and1.12cm–1,respectively.TheseresultsindicatedthattheEr3+/Tm3+co-dopedlead-silicateglasseshadpotentialapplicationinnearinfraredlasers.

简介：随着教育信息数据不断增加，我们面对大量数据时无法获得最有价值的知识，从而降低了数字化教学资源的作用。以武汉纺织大学线性代数课程为例，用数据挖掘工具wlela，结合关联规则和决策树方法，从往年积累的真实数据中挖掘出有价值的信息，为该课程的教学改革提供有力的理论支持。实践表明：数据挖掘技术用于教育中能提高教学效果。

简介：云计算是一种新的计算模型,以成人行政管理（本科）中的＂政府经济学＂课程为例,利用云计算为网络学习平台,首先在线注册,之后讨论课程问题,再协作完成任务,最后发表成果共享,收到了良好的教学效果。

简介：本文就通过采取多种手段、组织灵活多样的课堂教学和上实验课等措施，以调动学习学习《C＋＋语言程序设计》课程的兴趣和主观积极性的实践，能收到良好的教学效果。

简介：专题式教学就是摆脱原来按照章节目录顺序进行教学的局限,根据问题划分成相应专题进行讨论和探索展开课堂学习的教学方式。它能够提高教师的教学能力,解决教学过程中教学方法单一,教学内容设计不合理等问题;提高学生学习兴趣,改善师生互动关系;克服教学资源分配不合理,凸显教育公平理念。实施专题式教学是＂基础＂课教学模式改革的需要,是促进＂基础＂课教育健康发展和调动学生学习＂基础＂课兴趣的需要。专题式教学要求提高教师的专业能力和教学能力,完善教学评价机制,规范教学内容设计。

简介：精品课程建设是教育部“高等学校教学质量和教学改革工程”的重要组成部分。精品课程网站是精品课程建设和评价的窗口，也是精品课程网络化在线学习的平台；是精品课程示范辐射的载体，也是教师与学生交流的媒介。本文从高职院校精品课程网站的构建与开发的必要性、可行性及具体措施等方面开展研究，以达到推进课程改革，促进资源共享，提高教学质量的目的。

简介：建构主义学习理论告诉我们，学生在教师的教学中应该起着主导作用，教师的教学应该是培养学生的自主学习能力以为其终身学习打下基础。在这一理论的指导下，教师和学生均应该对自己的“教”与“学”行为进行重新思考。本着这个理论，笔者就目前高校英语专业课程设置的定位及结构体系等方面进行了分析，结果发现，需求分析和品质机能展开理论在课程设置中起着重要作用，它们在课程设置中的影射直接关系着课程设置的科学性和成败。

简介：大学计算机基础教学传统模式存在着缺陷和不足,应进行系统需求分析和系统设计,最终实现计算机基础课程网络教学系统的各项功能。利用该系统,学生可以实现对教学内容的课前预习及课后复习工作;教师能减轻教学负担、改善教学效果。实践表明,该系统的可操作性好,便于用户上手,能有效调动学生的学习热情,从而提高学习成绩。

简介：实验教学对于高等学校大学生全面掌握和深入融会专业知识,培养科学思维和创新能力起着至关重要的作用,它与理论教学共同构成了完整的专业人才培养体系。本文针对我校实验教学改革背景下实验教学面临的新环境与现实需要,较为深入地分析了传统实验教学的特征,剖析其存在的问题,在此基础上探讨探究式实验教学的形成与发展、独特内涵及理论最新进展,论证探究式实验教学应用于《证券投资分析》课程的必要性与作用,最后构建以学生为主体、教师为引导、学生自主探究为主线的证券投资分析探究式实验教学模式。

简介：《物流采购管理》是一门专业性很强的物流管理类专业学科，但由于条件限制，传统教学缺乏实践操作性，教学过程与学生的期望有一定的差距。我们引入情景模式的项目教学方法，由教师根据教学的需要将复杂和繁琐的课程体系模块化，用实践项目对模块进行分解，并通过任务的形式来进行完成，由学生自主地进行完成项目的教学模式。这种模式改变了传统灌输式教学模式下学生学习的动力和能力不足的问题，有利于激发学生的学习采购管理热情和积极性，培养学生独立分析和解决问题的能力。

简介：本文通过问卷调查和小组访谈的方式对《市场调查》课程中任务驱动教学法的实施情况进行调查研究。通过研究,明确了《市场调查》课程的教学现状、存在的问题以及学生的需求,为任课教师提高该课程的教学质量、学生提高学习效率提供了参考,也为该课程的教学改革提出了一些建议。

简介：基于创业教育视阈,分析了管理类专业实践教学体系存在的缺乏实践性、难以深入和缺乏系统性等问题,结合企业行为模拟课程的实践价值,以企业行为模拟课程为核心构建了管理类专业实践教学体系。